GE MiCOM P40

The following data is provided:
LNx LossRate Sec: This is the percentage of SV frames missing during the past second for LNx.
LNx FrmLoss Cuml: This is the number of frames lost since the last reset. The most recent reset time is listed in the
IED menu.
LNx Error Second: The Frame Error Seconds is a cumulative value since the last reset. If the Frame Loss Rate
exceeds 1.25% (one sample per cycle on average for one second), the IED records this as an Error Second.
where x is the number of the node (e.g. LN1)
The Sampled Value loss data can be reset manually with the LossRate Reset command in the IEC61850-9.2LE
column.
4.3.1 SAMPLE LOSS DATA
The Sampled Value loss data can be reset manually. The following data is provided:
LNx LossRate Sec: This is the percentage of SV frames missing during the past second for LNx.
LNx FrmLoss Cuml: This is the number of frames lost since the last reset. The most recent reset time is listed in the
IED menu.
LNx Error Second: The Frame Error Seconds is a cumulative value since the last reset. If the Frame Loss Rate
exceeds 1.25% (one sample per cycle on average for one second), the IED records this as an Error Second.
where x is the number of the node (e.g. LN1)
4.4
VT SWITCHING
This function is used in the P442, P444, P446, P546 and P841B IEDs which have an IEC 61850-9-2LE interface. It
allows the user to switch the three-phase voltage input between two independent Sampled Value frames while the
IED is in service. This may correspond to two separate voltage transformers in the primary system. The VT Switch
function also allows the single-phase check synchronising voltages to be selected from three independent
Sampled Value frames.
The VT switching function is disabled by default. To enabled it, in the IED menu IEC 61850-9-2LE, select VT Switch
Mode then Enabled.
Three-Phase Voltage Input Switching
The three-phase voltage can be switched between two Sampled Value frames. These are [VA1 VB1 VC1] and [VA2
VB2 VC2]. The switching is controlled by the status of the DDB VABC Select x. The logic is shown in the following
table.
DDB
VABC Select x VA VB VC Selection
0 VA1 VB1 VC1
1 VA2 VB2 VC2
The change of VT input is accepted only if the DDB status change is effective for a minimum of 20 ms. The selected
three-phase voltage is only displayed when VT Switch Mode is enabled.
Single-Phase Voltage Input Switching
There are two single-phase voltages associated with the System Check function. These are Vsc1 and Vsc2. The
selection of voltage Vsc1 is controlled by the combined status of two DDBs, Vsc1 Select x1 and Vsc1 Select 1x as
shown in the following table.
DDB
Vsc1 Select x1
DDB
Vsc1 Select 1x Vsc1 Selection
0 0 Vcs1
Chapter 6 - Sampled Value Operation P446SV
100 P446SV-TM-EN-1